AD5446 IS NOT GIVING RESPONSE

sir /madam ad5446 is not giving any response i am using PIC PIC32MX795F512L IC and using spi4 for driving the dac in unipolar mode with 5 mhz frequency,10 volt reference voltage and 5 volt supply and sending data in 16 bit mode to the dac ic and while observing the output lines of spi waveform pattern is as given in data sheet but no output is coming on the dac out put lines

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